Kvaliteta digitalnih otisaka uvjetovana starenjem tiskovne podloge

scientific master's theses

• Author: Igor Majnarić
• Mentor: Stanislav Bolanča (mentor)
• Committee member: Stanislav Bolanča (član povjerenstva)
• Granter: University of Zagreb; Faculty of Graphic Arts; Zagreb
• Defense date and country: 2004-00-00, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Graphic Technology
• Universal decimal classification (UDC): 655 - Graphic industries. Printing. Publishing. Book trade

Abstract

Papir, najviše korištena tiskovna podloga u tiskarstvu, podložan je mnogim

degradacijskim promjenama. U tim procesima sudjeluju reakcije kisele i

alkalne hidrolize, oksidacije ili pak termolize. Najčešća reakcija je ipak

hidrolitička degradacija molekula celuloze, kao najvažnije konstitucijske

specije u građi papira. Spomenuti mehanizmi izmjenjuju se u procesu

prirodnog starenja. Premda individualne vrijednosti ovih reakcija variraju,

pretpostavlja se da su vrijednosti degradacijskih procesa povezane s

temperaturom. Stoga se smatra da bi rezultati ubrzanog starenja mogli koristiti

za stvaranje zaključka o mehanizmu i zakonitostima u uvjetima prirodnog

starenja. Takav pristup omogućava praćenje i studiranje posljedica

spomenutih pojava na papiru kao i na otisku.

Tiskovne podloge uvrštene u istraživanje su: papir za umjetnički tisak, naravni

papir i reciklirani papir. Za otiskivanje su korištene slijedeće tehnike

otiskivanja: elektrofotografija (Indigo E-print 1000, Xerox DC 50) i Ink Jet

(Epson 1200+). Papiri i otisci ubrzano su ostareni. Daljnja istraživanja raena

su na novim otiscima, ubrzano ostarenim i otiscima načinjenim na papiru

koji je prethodno ubrzano ostaren. Praćena je kvaliteta reprodukcije, te

mehanička i optička svojstva otisaka. Kolorne vrijednosti 100% otisnutih

procesnih boja (CMY) starenjem se takoer smanjuju. Promjene su

najuočljivije na Ink Jet i Xerox otiscima što je specijalno naglašeno na

papirima za umjetnički tisak. Vizualnom kontrolom “metodom prosječnog

promatrača” potvrđeni su aparativno dobiveni rezultati.

Istraživanja su u znanstvenom pogledu doprinos pojašnjenju optičkih i

mehaničkih promjena, te kvalitete reprodukcije u funkciji starenja. Istraživanja

su interesantna i u primjeni, posebno u povećanju kvalitete određenog

grafičkog proizvoda.

Abstract (english)

Paper the most often used substrate in printing, is subjected to many degradation

changes. In these processes many alkaline hydrolysis, oxidations or

thermoysis participate. The most often reaction is the hydrolytic degradation

of the cellulose molecules as the most important constituent species in the

paper structure. The mentioned mechanisms interchange in the process of

natural ageing. Although the individual values of theses reactions vary, it is

supposed that the values of the degradation process are combined with temperature.

Because of that it is believed that the results of the accelerated

ageing could be useful for creation the conclusion about the mechanism and

lawfulness in the conditions of the mentioned phenomena on paper as well

as on print.

Printing substrates used in investigations are: fine art paper, natural paper

and recycled paper. Following printing techniques were used for printing:

electrophotography (Indigo E-print 1000, Xerox DC50) and Ink Jet (Epson

1200+) papers and prints were accelerated aged. Further investigations were

performed on the new prints accelerated aged and on the prints made on

paper which was accelerated aged before. The qualities of the reproduction,

mechanical and optical properties of prints were monitored. Color values of

100% of the printed process colors (CMY) decrease also by ageing. The

changes are the most visible on Ink Jet and Xerox prints, which is specially

stressed on fine art papers. By visual control, by the method of an average

observer the obtained results were confirmed by apparatuses.

In the scientific sense the investigations are the contribution to the explanation

of the optical and mechanical changes and the quality of reproduction in

the function of ageing. The investigations are interesting in the application,

especially in the quality increase of the determined graphic product.

• Keywords: digitalni tisak; ubrzano starenje tiskovne podloge; kolorimetrijske karakteristike otisaka; mehanička svojstva otisaka
• Keywords (english): digital printing; accelerated ageing of the printing substrate; colorimetric characteristics of the prints; mechanical properties of prints
• Language: croatian
• URN:NBN: urn:nbn:hr:216:649455
• Study programme: Title: Postgraduate university study programme Graphic engineering; Course: Graphic technology; Study programme type: university; Study level: postgraduate; Academic / professional title: magistar znanosti (magistar znanosti)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2024-07-17 16:57:55